Security system with mobile comunication

The main aim of this work is to create such an electronical alarm system, which could be used at permanently or temporary inhabited areas or in cars. The advantage of this system is the possibility of the silent alarm, which is carried out by SMS. These messages are sent by to the owner or to the security company by GSM service. The first part of the project tries to solve the problem of guarded areas. It is necessary to deal with this problem, so that the system itself could work correctly. The second part describes the SMS contents and the way of communication between the microprocessor ATmega16 and the mobile phone Siemens C35 by AT commands. Up-to-date price comparison of these services, which are offered by mobile provider, are included in this part. The focus of the third part is hardware realisation of electronical alarm system. This part sloves connecting of battery backup, battery recharging in the mobile phone and analyses single sensors as well. In the last part the suitable algorithm with the help of a higher level programming language C is used for the microprocessor system